After Friday's attacks in Paris, people shared their thoughts, frustrations and feelings on social media.

The overall sentiment was sadness, and though there were those who posted messages of hate, the message capturing the most attention was "Peace for Paris."

Jean Jullien, a French graphic designer, shared a simple drawing on Twitterand Instagram: a peace sign with the Eiffel Tower in the center.

Jullien told Wired that it was very natural for him to connect the two symbols.

"It was my way of communicating with the people I know and showing that I was thinking about everyone affected in Paris," he said. "The fact that people shared it and used it, well, in a way that's all for the better."

Overnight, users all over the world took up the "Peace for Paris" symbol to show solidarity — and of course — promote peace.

Friday night in New York City, a group of roughly 70 people, most French exchange students, gathered in Union Square for a vigil. They circled around the Peace for Paris sign.

The symbol also made its way into sporting events, like the final round of the BMW Masters in Shanghai, China. In the U.S., Ohio State's quarterback wore the sign on his shoe.